Gas filled discharge tube



Aug. 20, 1935. w MULDER ET AL 2,011,904

GAS FILLED DISCHARGE TUBE Filed Apfil 1, 1932 Inverodrra: JG.ZY/.Hulderand 1111 van deffloraf,

JFfiy.

providedwhichscreen'is connected to the supply.

of the quick ions coming from the tube 6, which This tube 8 is helicallywound over part of its length l4 so a'slt'o provide an' elasticarranger, ment. Thehelix l4=is protected by'cylindrical caps l5 and I6consisting of glass.

The anode chamber always remains Warmer than the condensation space 1,since the dis-- charge produces more heat in the anodechamber and itsheat radiating surface is smaller. Also when the operating current oithe tube is switched ofi. while the incandescent cathode'remainsswitched on, the anode chamber remains warmer than the condensationspace since-the. anode chamber is heated by the warm air'ascend-Consequently no ing from the cathode chamber. mercury will condense inthis chamber.

. The metal tubes 6 and Bserveto conduct away the electric charge fromthe tube wall, for which purpose a proper potential is; applied to them.

Furthermore the tubes maybe used as ignition electrodes, so asmaterially toreduce the ignition voltage. Theymay also bexused as a.grid for influencing the discharge. a I x The tube 6 comprises anextension." which extends around the cathode and by which the ignitionisstill further improved. Furthermore as shown a screen I 8, shown incross section, may be conductor of the cathode. This screen; to whichcathode potential is applied, attracts a large'pa'rt otherwise wouldstrike the cathode. Bythis construction the life of the cathode isincreased,

In order to avoid the bombardment of the-ions as much as possible, the.cathode is arranged *1 outside of the axis of thetube'G.

principle of theinventioni In'Fig. 2Qcorresponding parts are denoted bythe same reference numerals as in Fig. 1,so that the operating of theparts shown therein Willi be readily understood. The difference from theform of construction referred to above essentially con-- sists in thatthe anode chamber I is partly sunk in "a recess I2 of thecathode'chamber owing to which the heat of the cathode chamber may stillbetter be transferred to the anode chamber.

'Moreover acap i3 is provided by-which the ascending hotair isintercepted and whichserves 'essentiallyof two uniform cylindricalbodies inwhich serves forcatching the ions and bywhichat the'same timethe heat radiation of the cathode is reduced.

In this form of construction the tubes 6 and 9' are furthermore providedwith metal points 2| and-20 by which the ignition is improved.

It is also possible to use otherheating means for example a heatinghelix arranged around the anode chamber. Various other "forms ofconstruction are possible without deviating What we claim is:

1'. A discharge tube comprising at least two electrodes one of. whichisan electron-emitting incandescent cathode and the other an anode, a.

chamber around'each electrode, a filling consist-.-

from the ing at least partly of a vapor, and a condensation chamber inthe discharge path between the anode chamber andthe cathode chamber, theanode chamber being disposed substantially directly -abe ve the cathodechamber and the condensation chamber being,disposed sidewise with regardto the cathode chamber. I 1 2. A discharge tube'comprising anincandescible electron-emitting cathode and a chamber therefor, ananodeand a chamber therefor, a filling consisting at least partly of avapor, a condensation chamber for the vapor disposed sidewise withregard to the anode and cathode chambers, the anode chamber partlyprojecting into the cathode chamber.

3. A rectifier tube;.compri'singan incandescibleelectron-emitting;cathode and a chamber there-' chamber forv thecathode, an anode and an anode chamber,.a filling consisting at leastpartly of a vapor; .a. condensation-chamber for the vapor disposedsidewise with regard toithe anodeand cathode chambers and connected tosaid chambars by means of metal tubes, and metal ignition rodsextendingvthrough said tubes into the condensation chamber. I

A rectifier tube comprising an incandescible cathode and a cylindricalchamber" therefor, an anodeand a cylindrical chamber therefor, saidanode chamber being disposed on top of the cathode chamberwithout directcommunication between the cathode and anode chambers, said cathodechamber having a larger diameter than the anode chamber, and an envelopesurrounding said anode chamber and having substantially the samediameter. as-the cathode chamber and axially aligned therewith, and acondensation chamber disposed sidewise relative to said anode andcathode chambers and connected with both chambers, the discharge betweensaid cathode and anode taking place through said condensation chamber.

6. A rectifier tube comprising a cathode and a chamber therefor, ananodeand a chamber therefor, said anode chamber being disposed on top of saidcathode chamber,and 'a condensation chamber. sidewise disposed withregard to said anode and cathode chamber and interconnected with saidanode and cathodechambers respectively'by means of tubular metalmembers'the discharge between said cathode'and anode passing throughsaid condensation chamber, the metal member between the condensationchamber and the cathode chamber extending within. the cathode chamberclose to the cathode, said cathode being disposed outside of. the axis.of this metal member.

JOHANNES GIJSBERTUS I WILI-IELM MULDER. HAJO LORENS VAN DER HORST.

